43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
package smartcontract
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import (
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"bytes"
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"fmt"
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"sort"
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"github.com/CityOfZion/neo-go/pkg/crypto/keys"
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"github.com/CityOfZion/neo-go/pkg/vm/emit"
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"github.com/CityOfZion/neo-go/pkg/vm/opcode"
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)
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// CreateMultiSigRedeemScript creates a script runnable by the VM.
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func CreateMultiSigRedeemScript(m int, publicKeys keys.PublicKeys) ([]byte, error) {
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if m < 1 {
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return nil, fmt.Errorf("param m cannot be smaller or equal to 1 got %d", m)
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}
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if m > len(publicKeys) {
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return nil, fmt.Errorf("length of the signatures (%d) is higher then the number of public keys", m)
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}
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if m > 1024 {
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return nil, fmt.Errorf("public key count %d exceeds maximum of length 1024", len(publicKeys))
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}
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buf := new(bytes.Buffer)
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if err := emit.Int(buf, int64(m)); err != nil {
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return nil, err
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}
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sort.Sort(publicKeys)
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for _, pubKey := range publicKeys {
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if err := emit.Bytes(buf, pubKey.Bytes()); err != nil {
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return nil, err
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}
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}
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if err := emit.Int(buf, int64(len(publicKeys))); err != nil {
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return nil, err
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}
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if err := emit.Opcode(buf, opcode.CHECKMULTISIG); err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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